Free · no account needed
Paste a game from Chess.com or Lichess. In about ten seconds you get every mistake explained, the move you should have played, and a drill that makes sure it sticks.
Already use it? Open the app →
Independent project — not affiliated with Lichess or Chess.com.
How it works
Paste a link or your username. A full-strength engine runs on your device and grades every move, then writes the lesson in plain English — accuracy for both sides, every blunder on its own board, the better move and why.
One tap turns the key moments into lines in a notebook: the game up to your mistake, then the right continuation. Already have a repertoire? Paste a Lichess study and every chapter becomes a drillable line, or enter moves on the board.
Drill the lines with spaced repetition until they stick, solve puzzles taken from your own games, and see the same mistake stop repeating. My report shows where your games leave the book and what it costs you.
Share a game with your coach and their notes land on the exact move. Students join a class with a code — no email, no account setup. Coaches see what was drilled and when.
A full game against the built-in engine. It plays at your rating, so games land near a coin flip, and only your own moves change the number — no hints, no eval bar.
Notebooks are plain PGN: export everything in one click, print a notebook as a clean study sheet, and use the app offline once it has loaded.
Every feature, including the coach suite. There is no trial and no tier that unlocks the good part. An optional Supporter donation ($3/mo) pays for the servers and unlocks nothing — if money is tight, use the app and don’t think about it.
Paste one game. No account, no install, nothing to cancel.
Free forever · works offline · your notebooks are plain PGN you can take with you.